Mithrandir Metrics
Player Athletics Refreshed Jun 12 06:00 AM ET
Player profile / Athletics

Mark Leiter Jr.

P · Bats/Throws R/R · 6' 0", 210 lb · Age 35

Cards
0
Modules
0
Live Δ
yes
Club Athletics Position P Roster Active Status Healthy / active roster
Traditional line

Season by season

3D Pitch Lab Projections
WLERAGGSSVIPSOWHIP
2024454.50600058.0861.33
2025674.84590248.1541.53
2026015.20300427.2301.41
7 Seasons16304.643001513380.04261.33
At a glance

Season percentile report

The headline weighs outcome stats (xwOBA, barrels); each bar averages its full strip group below. 100 = best in MLB.

2026-06-12
46
Pitching
percentile
Pitching9 metrics
55
Arsenal5 metrics
47
Rolling projection

Preseason / current pace / Bayesian update

Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.

2026-06-12
ERA preseason4.25
ERA current pace5.13
ERA rolling p504.56
Observed weight36%
ERA
2.74 3.61 4.56 5.52 6.39
FIP
2.25 2.79 3.40 4.01 4.55
K%
21.8% 24.1% 26.6% 29.1% 31.4%
BB%
6.1% 7.3% 8.7% 10.0% 11.3%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-12
Pitching · percentile strip
WHIP1.45
26
ERA5.13
22
BB%7.5%
68 +21 vs proj
K%25.4%
69
xwOBA allowed0.322
43
Barrel allowed4.5%
87 +44 vs proj
Fastball velo92.3
20
Hard-hit allowed32.6%
87
Whiff%25.9%
72
Mithrandir+

Stuff+ and arsenal context

How nasty this pitcher's stuff grades in our pitch-level model. Missing coverage is shown explicitly.

2026-06-12
Curveball Stuff+104
75
Cutter Stuff+99
26
Fastball Stuff+91
6
Mithrandir Stuff+102
51
Sinker Stuff+106
76
Rolling form chart

xwOBA allowed snapshot line

Live snapshot series; true 50/100 PA windows require PA-level logs

12 snapshots
Mithrandir Metrics ROLLING XWOBA LINE Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Rolling xwOBA allowed Leiter Jr.., Mark · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.313 0.322 2026-06-01: 0.3372026-06-02: 0.3372026-06-03: 0.3372026-06-04: 0.3372026-06-05: 0.3242026-06-06: 0.3242026-06-07: 0.3242026-06-08: 0.3192026-06-09: 0.3192026-06-10: 0.3222026-06-11: 0.3222026-06-12: 0.322 2026-06-01 2026-06-12 xwOBA allowed MITHRANDIR · CHARTS
Optimization map

Arsenal optimization map

Pitch-shape context from this pitcher’s current arsenal snapshot. Hover a pitch to inspect usage, movement, and bat-missing context.

6Pitches 2026Season 32%Top usage
ride armside gloveside +Arsenal gap +Shape contrast
Zone profile

Aggregate zone heatmap

Aggregate zone metrics from seasonal Statcast leaderboards.

Mithrandir Metrics ZONE HEATMAP Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Pitch Zone Profile Leiter Jr.., Mark · Aggregate zone metrics; not pitch-by-pitch locations Edge: 36%36%Zone: 46%46%Whiff: 26%26%Called strike: 18%18%First pitch strike: 51%51%Hard hit allowed: 33%33% Dashed border = aggregate mixed-batter zone proxy MITHRANDIR · CHARTS
Pitch arsenal

Usage mix, movement map, and Stuff+ composition

2026 pitch-level arsenal aggregates; current season takes over after 100 tracked pitches across at least 2 pitch types. Descriptive pitch-type Stuff+ composition. Not a promoted predictive metric.

Watch the pitches in 3D →

2026
Mithrandir Metrics PITCH ARSENAL DONUT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Leiter Jr.., Mark · 2026 arsenal snapshot Split-Finger: 31.7%Sinker: 27.2%Curveball: 17.8%4-Seam Fastball: 13.5%Cutter: 8.8%Slider: 1.0% FS32% · 84 mphprimary pitch FS 32%SI 27%CU 18%FF 14%FC 9%SL 1% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Leiter Jr.., Mark · 2026 arsenal snapshot 18″36″54″72″ Split-Finger: 32% usage, 2″ horizontal break, 36″ drop, 84.3 mphFS84 mphSinker: 27% usage, 0″ horizontal break, 21″ drop, 92.2 mphSI92 mphCurveball: 18% usage, 2″ horizontal break, 67″ drop, 74.0 mphCU74 mph4-Seam Fastball: 14% usage, 0″ horizontal break, 16″ drop, 92.3 mphFF92 mphCutter: 9% usage, 1″ horizontal break, 25″ drop, 89.8 mphFC90 mphSlider: 1% usage, 2″ horizontal break, 42″ drop, 82.5 mphSL83 mph less drop ↑ more drop ↓ · horizontal break ↔ · dot size = usage · break incl. gravity MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
SI 37.7% 104 106 limited sample
CB 26.4% 73 104 limited sample
FB 21.4% 59 91 limited sample
FC 12.7% 35 99 limited sample
SL 1.8% 5 113 limited sample
Method note

Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.

Reference layer

Current snapshot

Age35
Height6' 0"
Weight210 lb
Debut2017-04-28
Live layer

Delta / regression

ERA Δ+0.99
K% Δ+0.002

positive regression

Regression watch

Unlucky so far. Better days ahead.

1.2σ gap
wOBA-against (actual)0.365
xwOBA-against (deserved)0.322

Jr.’s wOBA-against sits at 0.365, but the quality of contact underneath says it should be 0.322 — a gap of 0.043, 1.2 standard deviations from the MLB norm over 30 IP. The results have been worse than the process deserves; as the sample grows, expect the numbers to climb back toward the underlying level.

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
No Mithrandir card history is available for this player yet.
Projection links / recent games

Available detail

Pitcher Projections 202625.2% K | 4.14 ERAProjection
2026-05-20 @ LAA0 ER / 1 K1.0 IP
2026-04-20 @ SEA0 ER / 1 K1.0 IP
2026-04-15 vs TEX3 ER / 1 K0.2 IP
2026-04-14 vs TEX0 ER / 2 K1.0 IP
2026-04-11 @ NYM0 ER / 3 K1.0 IP